Electric motor, in particular a starter motor for an internal combustion engine

Abstract

The invention relates to an electric motor comprising an electric conductor for supplying current, connected to a contact piece which is in contact with a component of the electric motor. Said conductor has, in a central section, a rectangular cross-section.

1 . An electric motor, comprising an electrical conductor for a power supply, the conductor being connected to a contact piece ( 9 ) which is in contact with a component of the electric motor ( 1 ), characterized in that the conductor has a rectangular cross section in a central section ( 13 ). 
     
     
         2 . The electric motor as claimed in  claim 1 , characterized in that the conductor is welded to the contact piece ( 9 ) in the region of an end-side end section ( 14 ,  15 ), the end-side end section ( 14 ,  15 ) having a rectangular cross section, but with different dimensions than the central section ( 13 ). 
     
     
         3 . The electric motor as claimed in  claim 1 , characterized in that the conductor is in the form of a litz wire ( 6 ). 
     
     
         4 . The electric motor as claimed in  claim 1 , characterized in that two end-side end sections ( 14 ,  15 ) of the conductor each have a rectangular cross section with different dimensions than the central section ( 13 ). 
     
     
         5 . The electric motor as claimed in  claim 4 , characterized in that the rectangular cross sections of the end sections ( 14 ,  15 ) are produced by reshaping. 
     
     
         6 . The electric motor as claimed in  claim 1 , characterized in that the central section ( 13 ) of the conductor is flatter and has a greater width and a lower height than at least one end section ( 14 ,  15 ). 
     
     
         7 . The electric motor as claimed in  claim 6 , characterized in that an angle (α) at the transition from the wider central section ( 13 ) of the conductor to at least one narrower end section ( 14 ,  15 ) is a maximum of 75°. 
     
     
         8 . The electric motor as claimed in  claim 1 , characterized in that the ratio of width to height of the central section ( 13 ) of the conductor is at least 3:2. 
     
     
         9 . The electric motor as claimed in  claim 1 , characterized in that an end section ( 14 ,  15 ) of the conductor has a square cross section. 
     
     
         10 . The electric motor as claimed in  claim 1 , characterized in that two end sections ( 14 ,  15 ) of the conductor are welded to contact elements ( 9 ,  10 ). 
     
     
         11 . The electric motor as claimed in  claim 1 , characterized in that one end section ( 14 ,  15 ) of the conductor is connected to a cable lug ( 10 ). 
     
     
         12 . The electric motor as claimed in  claim 1 , characterized in that the contact piece ( 9 ) is connected in insulated fashion to a pole housing ( 2 ) of the electric motor ( 1 ). 
     
     
         13 . The electric motor as claimed in  claim 1 , characterized in that a conductor ( 6 ) is connected to a carbon brush ( 5 ), which is in contact with a commutator ( 4 ) fixed to an armature.